Many doctors also recommend not to put premature infants in swings or bouncy seats for the first few months at home. These studies did not account for infants who succumbed in the delivery room or on the way to intensive care. However, there is wide variation. Premature girl models free separation Premature girl models free the placenta placental abruption. The striking similarities in response to extreme prematurity in the lung and brain imply that agents and techniques that benefit one organ are likely to also benefit the other. The causes of premature birth are frequently unknown.